Here's Lucy Season 4 - Episode 23 | CBS 1972

Viv shows up for a surprise visit, and tells Lucy she may stay in California for a year, but everything goes awry when Harry fires Lucy and hires Viv in her place, making Lucy furious. After a few weeks, Harry can't stand Viv and Viv can't stand Harry. Lucy comes up with a scheme to get Viv to quit, but Kim blabs the whole thing to Viv.